In this experiment, we used 2phenoxy ethyl acrylate 2pea and tripropylene glycol diacrylate, two acrylic monomers, to prepare pdlc, and we compared various preparation. A dyedoped polymerdispersed liquid crystal pdlc is an attractive material for application in smart windows. Flexible random laser from dye doped stretchable polymer film. Flexible random laser from dye doped stretchable polymer. Resonance fluorescence spectra of dyedoped polymers. Abcd analysis of dyedoped polymers for photonic applications. In the 1990s, new forms of improved pmma, such as modified pmma, with high optical quality characteristics were introduced. The wobblinginacone model successfully describes the restricted movements of the encapsulated molecules. Notable among these new gain media are organicinorganic dyedoped. The transition from incoherent to coherent random laser in. We report on timeresolved fluorescence anisotropy studies of poly9vinylcarbazole pvk nanoparticles nps encapsulating coumarin 153 c153 and nile red nr. In this paper, the laser characteristics of rhodamine 6g rh6g doped polymethyl methacrylate pmma rods. In the present work we study the optical properties of a new photonics medium consisted of an. Here we report the fabrication of dye doped polymer stabilized liquid crystals pslcbased smart windows.
Fabrication of microcapsules for dyedoped polymerdispersed. The sample doped with dichroic dye shows a slight color in the offstate and strong color in the on. The change occurring on droplets morphology with the change in dye concentration and voltage was investigated by means of polarising optical microscope and. Slow light structures in dyedoped polymer waveguides. Photothermal effects in nematic liquid crystals nlcs on a dyedoped polymer film are investigated using a crystal rotation method combined with a pumpprobe technique. Incorporation of dye molecules in polymer waveguides has driven the development of solidstate dye lasers and optical amplifiers 57 leading to the growth of costeffective photonic technologies. Solid state dye doped polymer is an attractive alternative to the conventional liquid dye solution. If the silicone is doped with a dye, the absorption spectrum or fluorescence spectrum of the dye is reflected in the transmission spectrum of the fiber. The displacement angle monotonically increases as a function of the distance between the illumination point and the fiber axis, and is consistent with differential light.
Polymerisationinduced phase separation method was used to prepare dyedoped polymerdispersed liquid crystal dpdlc films consisting of nematic liquid crystal, photocurable prepolymer and a dichroic dye. Suggested citation aithal, shubhrajyotsna and aithal, p. However, most existing technologies are often angledependent and complicated, which hinder the useful range of realtime application. Photothermal effects in nematic liquid crystals nlcs on a dye doped polymer film are investigated using a crystal rotation method combined with a pumpprobe technique. Poly methylmethacrylate pmma polymer was doped with the phenol red dye dissolved in a mixture of chloroform and little quantity of methanol, used as suitable solvent for both the dye. Redbs dyedoped pva films were synthesized by solving red bs dye in pva solution.
Dye doped polymerfilms have larger application areas because of the fact. Energy transfer in coumarin 503 dye doped polymer laser. The optical parameters of the prepared phenol red dye doped polymer films, absorption coefficient. Jump to content jump to main navigation jump to main navigation. Characterization of dyedoped polymer films as recording. The displacement angle monotonically increases as a function of the distance between the illumination point and the fiber axis, and is consistent with differential. The films were prepared using the casting technique. Both liquid and spraycoated homogeneous film samples of 22. Preparation of dyedoped polymerdispersed liquid crystals. Comparative study on azo dyedoped polymer films for optical.
Polymers free fulltext dyedoped electrically smart. Nonlinear effetcts in dyedoped polymer optical fibres for optical communication submitted by emmanuel lemoine on mon, 06022014 18. Effect of dye concentration on the optical properties of redbs dye. The first report of the observation of photobleaching in polymerhost. Photovoltaic effect in dyedoped polymer films with freesurface and sandwich structures. Synthesis and investigation of phenol red dye doped. Various embodiments provide dye doped polystyrene microspheres generated using dispersion polymerization. Materials and experimental details the solochrome dark blue dye has molecular formula c 20 h n 2 na o 5 s with a molecular weight m.
The complete morphological, electrooptical and dielectric study of dichroic dyedoped polymerdispersed liquid crystal. The advantages of dyedoped polymer matrices over polymers and dyes, separately, are analyzed. Dyedoped organic polymer thin film waveguide laser spie. The complete morphological, electrooptical and dielectric. Optical properties of fluorescent dyedopedpolymer thin film. Optimum concentrations have been determined depending on the normal. Study of third order optical nonlinearity in daspb dyedoped. The shape of this volume can be spherical or moulded to a shape suited to the efficient capture of light for excitation of the dye and effective display of the fluorescent light. Random laser of r6g dye and tio2 nanoparticals doped in pmma. Us6888862b2 dyedoped polymer nanoparticle gain medium.
In the present work we study the optical properties of a new photonics medium consisted of an epoxy based polymer as matrix with dissolved binary solutions of rhodamine 6g and rhodamine b. We wifi discuss mainly the type c configuration in this paper. Here, we demonstrate a stretchable and threshold tunable rl by modulating the order degree of the nematic liquid crystal nlc that is caused by the alignment of polymer chain under tensile force. Response time of plastic optical fiber doped with organic. In this paper, the laser characteristics of rhodamine 6g rh6g doped polymethyl methacrylate pmma rods, modified with ethyl alcohol etoh, are examined by nitrogen laser, and second harmonic nd. Lessard, and michel bolte characterization of dyedoped polymer films as recording materials. Jul 08, 2009 we present studies of fluorescence photomodulation and solvatochromism in nanoparticles of the conjugated polymer poly2methoxy52ethylhexyloxy1,4phenylenevinylene mehppv doped with a photochromic spirooxazine dye.
Organic nonlinear material, dye doped polymer films, optical limiting, open and closed aperture z scan, daspb doped pmmama films suggested citation. Photochromic dyedoped conjugated polymer nanoparticles. Dyedoped electrically smart windows based on polymer. Nonlinear effetcts in dyedoped polymer optical fibres for. Dyedoped polymer gain media laser samples of pyrromethene567 in a mixture with methyl methacrylate and 2hydroxyethyl methacrylate copolymer have been prepared and synthesized by the conventional thermal polymerization method ctpm using an oven, and by the gamma irradiation polymerization method gipm using cobalt60 60co. Display comprising a fluorescent dye doped polymer. Polymers free fulltext whitelight emission of dyedoped. Gain studies of rhodamine 6g dye doped polymer laser. Random lasers rls offer new functionalities inaccessible with conventional lasers, such as an alterable shape and an easy integration with flexible optoelectronic devices. The random laser rl based on organic rhodamine 6g r6g laser dye and titanium dioxide tio2 suspended nanoparticles have been prepared with polymethylmethacrylate pmma as a host.
Using these dye doped films, we demonstrate optical pc processing. Location and freedom of single and double guest in dye. Comparative study on azo dyedoped polymer films for. Whitelight emission of dyedoped polymer submicronic fibers produced by electrospinning. Investigation of spectroscopic and thermomechanical behaviors of. The uv exposure to an lc mixture including photoinitiator caused the degradation of the dye molecules. In this paper we report the experimental study of the enhanced backscattering from a rough surface through dyedoped polymer. Optical properties of fluorescent dyedopedpolymer thin. Conjugated polymer nanoparticles cpns harvest energy from photons and transfer it efficiently to dye molecules in their proximity. Investigation of optical properties of solochrome dark. Here, we report the development of a dichroic dyedoped flexible cholesteric polymer film optical filter with doublelayer structure consisted of two films with opposite handedness for laser protection application.
The absorbance a, the transmittance t, and the reflectance r spectra of the solochrome dark blue dye doped polymer films at different dye concentrations were recorded over the wavelength range 300 900 nm using the uvvis. Oct 19, 2016 irradiation of dye doped liquid crystals lcs with linearly polarized light leads to molecular reorientation, which manifests functional properties for various nonlinear optical nlo applications. Photothermal effects in liquid crystals on dyedoped. The fluorescence properties of doped nanoparticles with dyes in the spirooxazine form are identical to those in undoped control nanoparticles. Dye doped polymer medium for photonics applications aip conference proceedings 2075, 030011 2019. The fluorescence properties of doped nanoparticles with dyes in the spirooxazine form are identical to those in. Organic dyedoped polymer films for optical phaseconjugate. The dye doped polymer rods are synthesised by bulk polymerisation method. Here, we report the development of a dichroic dye doped flexible cholesteric polymer film optical filter with doublelayer structure consisted of two films with opposite handedness for laser protection application. In this paper the laser characteristics of coumarin 307 c307 doped polymethyl methacrylate rods modified with dioxane are studied under nitrogen laser excitation in a transverse pumping configuration and the variation of gain of the dye in solid medium for different pumping powers is studied. Smart windows using a pdlc can be operated simply and have a high contrast ratio compared to those of other devices that employed photochromic or thermochromic material. The effect of dye doping on pslc contrast was investigated.
Gain media research for ssdl has been rather active in the 21st century, and various new dyedoped solidstate organic matrices have been discovered. In such configuration the organic material is optically pumped by an electrically pumped inorganic device on chip. In this paper, the laser characteristics of rhodamine 6g rh6g. Various embodiments provide dyedoped polystyrene microspheres generated using dispersion polymerization. Here we report a machzehnder interferometer mzi waveguide with photochromic dyedoped polymer sensing films for uv light detection. A phaseconjugate pc wave is generated even when a probe wave is linearpolarized orthogonal to the pump polarization direction. My system features pfbt nanoparticles and a class of. Gain studies of coumarin 307 dye doped polymer laser. Some studies of interfacial effects between the top atomic layer of these doped pvdf films and sensing dye layer have been investigated by focusing on absorbance and fluorescence spectroscopy of the dye, which lead to how the orientation of these dyes change from being a component of this bilayer. Especially the electrical and optical properties of polymers have been extensively investigated. A gain medium for producing a light emission in a laser. A dye doped pslc cell fabricated by thermal curing can be used to provide high visibility of a seethrough display.
Azo dye doped polymer films were prepared on glass substrates using spin coating technique. This paper is a new attempt to integrate scientific research and social research by analysing the characteristics of dyedoped polymer films for photonics applications. In this paper, the laser characteristics of coumarin 1c1, coumarin 503 and a mixture of c1 and c503 doped polymethyl methacrylate rods modified with ethyl alcohol are studied under nitrogen laser excitation in a transverse pumping configuration and the variation of gain of the dye in. Preparation and characterization of pyrromethene567 dye. From their studies it was shown that the bleached dye molecular fragments did not absorb in the visible portion of the spectrum. Pdf study optical properties of r6g dye doped in polymer pva. We consider both the temperature dependence of the refractive indices of the nlcs and reorientation of the nlc molecules due to a temperature rise at the polymer surface. We report on what we believe is the first demonstration of an optically activated cantilever due to photomechanical effects in a dyedoped polymer optical fiber. Yag laser excitations in a transverse pumping configuration and the variation of small signal. Preparation of dye doped polymer dispersed liquid crystals using acrylic monomers, and enhancement of contrast by using thf solvent as a cleaning agent. In this paper we report the experimental study of the enhanced backscattering from a rough surface through dye doped polymer.
This engineering solution requires therefore an optimization of the organic gain medium under optical pumping. Composing a slabwaveguide by spincoating dyedoped organic monomer onto a glass substrate under uv irradiation to be polymer, frequency selective lasing is observed by the side pumping of an interference pattern of pump beam. Random laser of r6g dye and tio 2 nanoparticals doped in pmma polymer abstract fulltext html download as pdf size. Aug 08, 2001 composing a slabwaveguide by spincoating dye doped organic monomer onto a glass substrate under uv irradiation to be polymer, frequency selective lasing is observed by the side pumping of an interference pattern of pump beam. The first report of the observation of photobleaching in polymer host. Guided transportation, turning in locomotion, and autonomous motion. However, in conventional dyedoped pdlc methods, dye contamination can cause. Lowthreshold lasing action and amplified spontaneous emission ase have been studied extensively in various dye doped films as well as. Certain functionalities, such as sodium styrene sulfonate, may be used to shift the equilibrium. My research focuses on a kind of photochromic dye that harnesses the transferred energy to perform its photochromic conversion, resulting in fluorescence switching of the cpn.
Pdf photovoltaic effect in dyedoped polymer films with. Axial and radial fluorescence of dyedoped polymer fiber m. This dot can take the form of a localised volume of the dyedoped polymer. Irradiation of dyedoped liquid crystals lcs with linearly polarized light leads to molecular reorientation, which manifests functional properties for. The fiber is observed to bend when light is launched offaxis. Azo dye doped polymer films, degenerate four wave mixing, nonlinear optical properties, optical phase conjugation. Authority us united states prior art keywords dye gain medium dn dt doped polymer prior art date 20021220 legal status the legal status is an assumption and is not a legal conclusion. We present studies of fluorescence photomodulation and solvatochromism in nanoparticles of the conjugated polymer poly2methoxy52ethylhexyloxy1,4phenylenevinylene mehppv doped with a photochromic spirooxazine dye. Dyedoped polymer nanoparticle gain medium download pdf info publication number. Unlimited viewing of the articlechapter pdf and any associated supplements and figures. The gain medium comprises a dye doped polymer nanoparticle matrix having an absolute value of dndt less than an absolute value of dndt of its dye doped polymer matrix. For this purpose, the synergetic efforts in material engineering sensing materials and optical engineering waveguide design and fabrication are both indispensable. Gain studies of rhodamine 6g dye doped polymer laser gain studies of rhodamine 6g dye doped polymer laser somasundaram, g. Study of third order optical nonlinearity in daspb dye.
Photonics and molecular design of dyedoped polymers. The repeating group is known as monomer or single unit. A dyedoped pslc cell fabricated by thermal curing can be used to provide high visibility of a seethrough display. The density of phonon states weighted by the electronphonon coupling coefficient has been determined, for the first time for a dyepolymer system, from the. Nondichroic dye tints the pslc sample in both off and onstate, which is not beneficial for increasing its offon contrast. We report on what we believe is the first demonstration of an optically activated cantilever due to photomechanical effects in a dye doped polymer optical fiber. The transmittance reached to 80% 90% for the phenol red dye doped polymer films at the low dye concentration 0. The evanescent tail of the light energy propagating in the core of such fibers extends into the silicone cladding, where it interacts with chemical species present in the polymer.
Origin of light scattering in dye doped polymeric waveguides. In this work, we observe the transition from incoherent rl in the dppdoped solutions and polymer membrane systems using dipcoating method to coherent rl in the. The effect of dye concentration, intensity of backward, forward pump, and inter beam angle between probe and forward pump beam on phase conjugation reflectivity are also studied and compared. Photobleaching and its severity in dye lasers were first studied by ippen et ap3.
Azo dye doped polymer films for nonlinear optical applications. Pdf synthesis and investigation of phenol red dye doped. The dyedoped polymer pixel can also be a dyedoped polymer dot. Nonlinear effetcts in dye doped polymer optical fibres for optical communication submitted by emmanuel lemoine on mon, 06022014 18. Polymerdispersed liquid crystal pdlc, with characteristics of high contrast and low driving voltage, has found many product applications and is an important material for new generations. We report a thermal curing method for fabrication of a dyedoped polymer stabilized liquid crystal pslc light shutter. Polystyrene microspheres may be doped with fluorescent dyes, such as xanthene derivatives including kiton red 620 kr620, using dispersion polymerization. Dyedoped polymer dispersed liquid crystal films for. Amplified backscattering from a rough surface through dye. We report a thermal curing method for fabrication of a dyedoped polymerstabilized liquid crystal pslc light shutter. Here we report the fabrication of dyedoped polymerstabilized liquid crystals pslcbased smart windows. Lessard, and michel bolte characterization of dyedoped polymer films as recording materials, proc. Random laser of r6g dye and tio2 nanoparticals doped in. Hybrid pumping appears as a promising compromise in order to reach the much coveted goal of an electrically pumped organic laser.
Synthesis and investigation of phenol red dye doped polymer films. An optically activated cantilever using photomechanical. The optical properties of the pure polymer film and polymer films doped with phenol red dye at different concentrations were investigated. Google has not performed a legal analysis and makes no representation as to. Photothermal effects in liquid crystals on dyedoped polymer. A dye doped polymer dispersed liquid crystal pdlc is an attractive material for application in smart windows. As a result, dyedoped lc droplets act as light scattering centers, and pdlc. Anisotropic fluorescence emission of a dyedoped fibre ring that is pumped by a ring laser beam. In this paper, the laser characteristics of coumarin 1c1, coumarin 503 and a mixture of c1 and c503 doped polymethyl methacrylate rods modified with ethyl alcohol are studied under nitrogen laser excitation in a transverse pumping configuration and the variation of gain of the dye in solid.
The sample doped with dichroic dye shows a slight color in the offstate and strong color in the. Nonlinear effetcts in dye doped polymer optical fibres for optical communication submitted by regis barille on sun, 06212015 20. Azo dyedoped polymer films, degenerate four wave mixing, nonlinear optical properties, optical phase conjugation. Dye doped polymer medium for photonics applications. Visible light fluorescence switching in dyedoped conjugated. My system features pfbt nanoparticles and a class of merocyanine dyes. Organic nonlinear material, dyedoped polymer films, optical limiting, open and closed aperture z scan, daspb doped pmmama films suggested citation. Fabrication of a dyedoped liquid crystal light shutter by. There are three possible configurations, as 1 volume effect, 2 doublepassage of waves effect, and 3 surface effect.